High quality 8 speed cassettehyperglide sprockets have a computer designed tooth configuration with contoured shift gates resulting in a crisp smooth shift even under loadgearing gives a low sprocket making it easier to climb even the steepest of hillssprockets are cut away to reduce weight without reducing rigiditynickel plated finish offers hard wearing resistance to corrosioncorrosion resistant steel cassette lockringfor 8 speed hg chains